Malicious PDF — malware analysis report

Static analysis result for SHA-256 c529adf61bb709e6…

MALICIOUS

PDF

89.3 KB Created: 2021-07-02 17:04:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c6f008262ad0648f35b7ffe5664c4fd6 SHA-1: a7ff32cfc00ee4e989dd7bf3754be47606e29093 SHA-256: c529adf61bb709e647550fce724ab83924185ec51d2e44277c43533d8114c9f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content hosted on these sites. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075284781f28---gajajudifixotonuse.pdf In PDF document text
    • http://hondaotohaiphong.vn/upload/files/xixulerepejog.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c998f864d8---nebew.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/zuvukudani.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/24286617245.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/nibofujexatigikowoze.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ce7a682f2ae---vizibajuguloge.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/a652efc378717e21b99cde5ab2f388b2/76212978370.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084458e1082b---34536235346.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d330236aa89---91934296407.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/ecde448d19c5a0b776f84d7779bc32b3/zisibuzulep.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/zodubixet.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/qmhm6neorb913aipe7q18puqjn/devedelukimimawim.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/1dc5f1fa217a2318b6ee8bc5dfaab4bf/74925453083.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/vi70v22e18s95k5m2amq4r8895/67566550866.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-4-29/20210429135140162097.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c0aa515f1---jatoxifufamogipibupivuna.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac452dbb49---xejawidupimojavopulivikol.pdfIn PDF document text
    • https://panama4d.com/contents//files/61296313432.pdfIn PDF document text
    • http://arslanemlak.come/file/wesizalugeg.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/228ccda2c1e4ea8ca15b1e04452389b9/jimeturijofuranerezofe.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ecde64a6a160c9f9329bf02fc4f06aee/nikodusomobodefomotozur.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/40371538068.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081c7cd15a05---donena.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=ashtaroth+hebrew+meaningPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4E 18296 bytes
SHA-256: c37cb6bf87010227602893fe9a28c1240fef2e75e02286ad3b6cd9e03b5e6767
font_02_sfnt_off00013f8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F8B 10716 bytes
SHA-256: d4ba485d0b946aa9b5d74ad997f482bbd0170eb52cec5f35a179efa8a1e1e5dd